Water Heater Machine Parts.

Water is considered an essential need for every home. Apart from being so useful in the kitchen, hot water is no doubt important to the majority of homeowners for bathroom use, including garden and garage cleaning. Isn’t it ideal to take a warm bath after a long day? A warm bath as studies show, leads to a calm blood circulation which is very healthy and relaxing to anyone.

The regular water we usually use at home takes a journey to at least 3 pipes as part of the whole system, which is good as it keeps the water clean and safe for consumption, however, this would lead to cold flowing water at your home’s faucets and showers. In the old days, water heating has already been part of household essentials but people have their own typical way of doing it. A kettle is what they usually use for heating water, a very old style yet effective at that time. Moreover, in modern days, in which people seem to be in a rush almost every day for work or other activities, the old way of heating water could no longer be a convenient way since it can take time. Today, the very easy way to get warmer water as you wish in every second of every day is by installing a water heater to your very own home.

Water heaters are now considered an important home fixture to more than 70 percent of the overall population in the US. Water heaters can be very advantageous, however, the wrong purchase would also be very possible if you lack knowledge about the product itself. Before purchasing a water heater, the essence of knowing every parts and accessories the machine contains typically stands importantly to get the right item for you and your family’s convenience.

Water Heater Parts:

1. Water Heater Tank – This is where the water is held for distribution. Depending on its size, the tank can carry a capacity of 40 gallons to 60 gallons (equivalent to 50 to 100 PSI). It is made from high-quality metal which guarantees a safe water source.

2. Water Heater Pipe – Whenever the water heater is used, in order for the hot water to be distributed to the whole household, it takes a flow to the heat-out pipe and is then released to every individual pipes connected to your kitchen, bathrooms, garage, and garden. It is placed over the top of the machine interior.

3. Water Heater Tube – The regular pipe where the source of water flows, is connected to this tube, leading the water to the tank for heating.

4. Water Heater Valves

Shut Off – It controls the flow of water towards the water heater. It literally shuts off the flow of water, usually placed above the machine.

Pressure – It controls the heat of the machine ensuring the unit’s safety function.

Drain – Located on the utmost bottom of the machine, this valve is very useful when cleaning the heater and when moving the unit to another location.

5. Water Heater mechanism – Implies the whole function of the machine, through this, the machine is capable of heating water in a safe and convenient way.

6. Water Heater Thermostat – This device controls the level of heat. With this, you’ll be able to know the current temperature of the water inside the heater.

7. Water Heater Sacrificial anode rod – Made durable for long-lasting span usage.


1. Water Heater Replacement Flammable Vapor Sensor
2. Threaded Dip Tube
3. Programmable Outlet Thermostat
4. Wall-Mount Water Heater Restraint Systems
5. Smart Temp Programmable Thermostat
6. Soft belt-style water heater straps support up 80-gallon water heaters
7. Water Heater Drain Valve
8. Temperature & Pressure Relief Valve Extended Shank
9. Heavy-Duty Element Removal Wrench
10. Water Heater Vent Power Kit
11. 120 Gallon Water Heater Strap
12. 7 Day Programmable Thermostat
13. EcoStat Mercury Free Mechanical Heating and Cooling Thermostat
14. Programmable Thermostat
15. Digital Thermostat
16. Standard Heating and Cooling Thermostat
17. Watts E-75 Water Heater Straps
18. Water Heater Connectors Corrugated
19. Water Heater Pan
20. Water Heater Timer

The water heater itself can be very impressive as it works entirely for your very own home, however, with the top-notch accessories, it can surprise you more, making its whole function advanced and innovative.

Supplying your machine some parts and accessories has advantages and disadvantages as well. If you were able to pick the right one, the chances of a longer time span of its operation should be expected, but if you have installed the wrong accessories, it can possibly cause breakage or damage to your machine which can affect its overall function. Be vigilant on your choices, make sure you know what your machine needs, especially its type and brand. There are tons of choices out there all you need to do is to be wise enough on making your selection whether you are buying online or on a nearby store.


Electric Timer Water Heater.

Water heaters can be very useful, but for some reason, it can give you much bigger charges, such as your monthly electric bill if you’re using the electric-powered water heater. Since the machine is made with such a disadvantage, experts understand this and made a perfect solution to it. There is an Electric Water Heater Timer, which works as an automatic device attached to the machine for use as a timer.

The Electric Water Heater Timer is made for energy saving purposes, since most of the machine use almost 220V. Just imagine using the heater every day, no doubt why you pay almost half of the added amount to your usual bill every month. Of course, the energy consumed by the machine itself depends on its time of usage.

Having a hectic schedule every day, would definitely be a hassle to keep an eye on the device all the time. For example, you have a scheduling of water heater usage, every morning/afternoon (5 am to 1 pm) and in the evening (6 pm-10 pm), therefore you have to turn off the heater whenever not in use from the specific time intended. What if you fail to do that every day, because you’re just too busy for work or school and forgot to turn it off? Then maybe you’ll just leave the machine as it is? That won’t do! It would be a great waste of money and energy. Water heater timer works best on this kind of scenario, simply because it obeys and follows automatically the on and off time-set to it, which means, there will be no more monitoring just to make sure the machine is working or not since the timer simply does the work for you.

How to Install the Timer?

1. First, identify your water heater’s power volts. Make no place for uncertainty because purchasing the timer depends on it. If your heater is 220V, then make sure you also purchase a timer that fits to a 220V water heater. (To know if it is a 220V or 120V, check on the label, usually found on the side of the machine.)

2. Prepare all the materials you need for the installation. Be sure that you bought the right cords/wires and timer, which fit your heater. Go to the nearest hardware store and ask for assistance. (220 Volt water heater – 220 Volt Timer)

3. Timers usually have a case along with when purchased. Take it out first and mount the case to the wall not so far from the machine.

4. Before making any connections, turn off the breaker first for safety purposes and to avoid electric shocks.

5. Remove the electric cord from your water heater and connect it to the timer.

6. Connect the ends of the cord you newly bought to the timer and the other end to the heater.

7. Put then the timer inside its case (mounted on the wall) and make sure it is well-screwed to the wall.

8. Set the timer and turn on the breaker once again.

The product comes with an installation and instruction manual, however, if you are not that knowledgeable with electric cords and stuffs, please let a professional electrician do it for you.

Water heater timers are truly very useful and a real energy saver. It is the greatest solution ever made by many users of such machines all over the world. Though the timer proves its effective work already, there are still additional facts and tips on how to lessen your electric charges:

1. Never turn on hot water whenever you are using cold water. Once the hot water is turned on, the cold water immediately runs through the heater which makes the machine work more and consume more energy.

2. If there are broken pipes or any leak problems, contact a plumber immediately.

3. Keep your water heaters clean. Dirty heaters will consume more energy.

4. Save water and reduce consumption. Don’t just leave a faucet or a shower on unattended.

5. It is recommended to wrap up your water heater and pipes with insulation.

6. As much as possible, turn down your thermostat.

With the help of a water heater timer and for being a responsible user, you surely will save at least 20% of your total electric bill a month. It is just wise to invest in any product if the quality you get is reasonable and of course if you are positive that you can benefit from it.



For many homeowners who would like to get the most out of their water heater units, they tend to consider getting the tankless ones nowadays because of the many advantages it can give. As the name implies, a tankless water heater does not actually have a water tank. Tankless water heaters are actually popular these days due to the fact that they do not take up too much space at home as well as it has a clever way it heats water on demand. This significantly minimizes the cost of electricity by means of not needing to heat up stored water all the time. It has been studied that if you use a tankless water heater in your home, you can reduce about 19% of the total home energy use consumed only via water heating.

Even if tankless water heaters have been around for some time in Japan, Europe, and other countries for many decades, they are surprisingly a new technology in the areas of North America. While there are those who extremely liked the idea of using tankless water heaters in homes of North America, there are others who still prefer to use the traditional tank-type water heaters.

If you feel like you are not thoroughly satisfied with your tankless water heater unit, take a look at these commonly reported issues and the possible solutions to each of them:

1. Be wise in obtaining the right size of the water heater unit for your home. Tankless water heater units are actually rated by the maximum rise in temperature possible at a specific flow rate. In order to make sure that your tankless water heater unit will deliver hot water adequately, first determine the flow rate and the rise in temperature that you will need. After that, find out the suitable flow rate by means of listing each and every hot water outlet that is to be connected to the water heater and then add up their flow rates in gallons per minute. Ensure that the tankless water heater unit that you will buy can really deliver the typical temperature rise of 39 degrees Celsius or 70 degrees Fahrenheit at the preferred flow rate.

2. In order to prevent the water from overheating, tankless water heaters need a minimum flow of water through the heating system. This ranges from a half-gallon per minute up to two gallons per minute. If this requirement is not met, then you would most likely be forced to, for instance, wash dishes and if you would like to keep the hot water going, the flow of the water must be higher as well. To solve this problem, ensure that the flow rates at outlets you will connect to the water heater unit exceeds its minimum requirements.

3. If you are worried about wasting water, select a point-of-use model. There are lots of tankless water heater users who strongly believe that they tend to waste a great deal of water while waiting for it to turn warm/hot. The wasting of water is actually caused by two factors:

The first cause is the number of feet of plumbing (which is particularly the cold water) between the tap and the water heater. Due to this, whole-home tankless water heater systems do not provide a water-saving advantage over the traditional tank-type water heater systems. Nonetheless, tankless water heater systems can actually be installed in a configuration that is point-of-use, with which a smaller, dedicated water heater is situated very near to the water outlet.

The of wasting water on the use of the tankless water heater is the amount of time that is needed for the water heater to generate warm/hot water. If you use a traditional tank-type water heater unit that already has hot water stored in the tank, that time is a definite zero. Thus, the tankless water heater units are deemed to be at a disadvantage at this point.

4. Properly ventilate the tankless water heater unit’s exhaust. Of course, the tighter a building is, the easier it is to produce differentials in pressure. This result to a combustion appliance to backdraft (exhaust gases such as carbon monoxide are brought inside the home). Whether you have a tankless water heater or a tank-type one, if you have a gas-fired water heater unit, it must be sealed-combustion and direct-vent in order to prevent dangerous gases like carbon monoxide from leaking into the living space.

5. Even if tankless water heaters are also called instantaneous water heaters, do not be fooled. This simply means that the cool water inevitably flows throughout the unit long before the sensors sense it and commence the water heating.

The best ways to solve this “weakness” is by preheating and buffering. Solar water heater units increase the water temperature that enters the tankless water heater, thus minimizing the time to heat the water. Also, a 5 to 10-gallon tank-type water heater unit that is plumbed right out of the tankless water heater dilutes the cool water with hot water in the tank, which makes the delay less evident. This solution may have a lesser up-front cost, but it is actually less energy-efficient.

6. Hire a plumber who is experienced in the installation of tankless water heater units. Even if a tankless water heater unit is smaller than the traditional one, it is rather complicated to install, due to the fact that it needs proper configuration and the sizing of the unit to fit into the house’s plumbing, electric or gas supply, as well as ventilation requirements. Many manufacturers will refer you to their local plumbing contractors if ever you need one. You can also ask the hardware store or the plumbing supply house where you have bought your tankless water heater unit to give you contact numbers of at least three experienced, factory-trained plumbing contractors, and you get to decide which of them you will hire once you get bids from all of them.

The tips mentioned above are some ways on how you can achieve optimal performance from your tankless water heater unit. There may be disadvantages to using tankless water heaters, but if you consider many factors, surely you will agree that the tankless units can cater efficiently for those who typically need hot water on demand.


In today’s time, the space in every home matters a lot. Many people live in homes that have small room spaces and they admit that they have trouble fitting every piece of furniture or item into any room. Devices such as water heaters and other appliances are very significant as they help make our lives easier and much more comfortable at home, but if you want to incorporate every item into your cramped up house, you need to think of a clever way.

Are you one of those homeowners or renters (who live in an apartment) who have a hard time trying to cope up with small room spaces and would like to just make everything fit? Fortunately, nowadays, there are many appliances that have undergone improvements wherein they are made even smaller and more compact, and they still turn out to perform much better than their earlier versions. One of these items is the water heater.

Before, the only water heater available is the tank-type or storage-tank water heater. However, it is a big disadvantage for you if you have a small house and a traditional storage-tank water heater. You will not have any space left to use as this type of water heater will typically take up all the space in any room of your small house. Thanks to innovation, those who have small houses or those who are residing in small apartments can now enjoy the benefits of hot water (without having to put up with a bulky tank-type water heater) with the use of tankless water heaters.

Tankless water heaters are different from tank-type water heaters because they only heat and provide water when needed. They can also help you save money because they do not generate standby energy losses that are common with storage water heaters. Below is a simple guide to tankless water heaters – how they work, how to choose the right one for you, and how to take care of it.

Tankless Water Heaters – How They Work

Tankless water heaters heat up water instantly without the presence of a storage tank. If a hot water faucet is turned on, the cold water passes through a pipe into the water heater unit. In there, either an electric element or a gas burner heats up the water. With this simple method, tankless water heaters can deliver a constant supply of hot water. You never have to wait for a storage tank to fill up with enough hot water so that you can enjoy using it. However, you need to know that a tankless water heater’s output actually limits the flow rate.

Generally, a tankless water heater unit can deliver hot water at a rate of 2 to 5 gallons (or 7.6 to 15.2 liters) per minute. Gas-fired tankless water heater units generate higher flow rates than their electric counterparts. However, there are times that even the biggest, gas-fired unit cannot give out enough hot water for simultaneous and numerous demands in huge households. For instance, if you take a shower and then another person uses the dishwasher at the same time, it may stretch a tankless water heater unit to its limit. In order to solve this problem, you can install and use two or more tankless water heater units, connected in parallel to let you use hot water simultaneously in different parts of the house. You can also opt to install a dedicated tankless water heater unit to appliances that really use up a lot of hot water at a time, such as a dishwasher or a clothes washer.

Tankless Water Heaters – How to Choose the Right One For You

Before you buy a tankless water heater unit, you need to consider the following factors:

Size – in order for you to have enough hot water at home and at the same time maximize its efficiency, you need to have a properly-sized tankless water heater unit. Ask a professional or someone who knows a lot about tankless water heaters to help you determine which water heater size is the best for your home.
Fuel Type and Availability – when choosing a tankless water heater unit, you have to think of the fuel type you will use as well as its availability and price. Fuel types include electricity, geothermal energy, fuel oil, propane, natural gas and solar energy.
Energy Efficiency – the easiest way how to determine if the water heater unit is energy efficient is to simply look for the Energy Star label. Energy Star-labeled products such as in water heaters can significantly reduce high energy bills, therefore saving you money each time. Did you know that a typical family that uses Energy Star qualified tankless water heaters actually saves more than $100 annually?
Tankless Water Heaters – How to Take Care Of It

When people buy a water heater, they tend to forget about it once it is properly installed in their homes. Most water heaters work perfectly well for the first few years, but without proper maintenance, they will easily break down.

Proper installation and maintenance of your tankless water heater is crucial if you want to optimize its energy efficiency.

How to install a tankless water heater unit actually depends on a lot of factors. Such factors include fuel type, local building code requirements, the weather and last but not least, safety measures, especially those concerning the combustion of gas-fired water heater units. Thus, it is wise to hire a qualified plumbing and heating contractor to help you install your tankless water heater unit.

If you are confident in installing the tankless water heater unit by yourself, you have to at least first talk to the manufacturer. Manufacturers typically possess the necessary instruction and installation manuals. Additionally, call your town or city for more information about getting a permit, if it is necessary, and also about local water heater installation codes. Regular water heater maintenance can truly extend the lifespan of your water heater unit and it can also reduce the loss of efficiency. Do not overlook the manual for specific maintenance instructions and recommendations.




Tank-type water heaters are very useful at home, and that is why it is a must that it works perfectly fine all the time. But what if you notice that your water heater unit seems to be bulging and leaking?

What can cause a water heater to bulge?

Bulging and leaking in water heaters are typically caused by an increase in the pressure of hot water that is inside the tank.

Excessive hot water pressure in the tank can lead to a bulging water heater and it can potentially deform the tank permanently. After this happens, problems will occur such as water heater leaks as well as the flue pipe and pipe fittings would be dislocated.

The common symptoms that you will notice on your water heater when there is an occurrence of excessive pressure are: when the topmost part of the water heater has cockeyed nipples, and the bottommost part of the head is reversed or bulged.

Tank-type water heaters are basically designed and thoroughly tested on maximum internal water pressures of about 300 psi, without any traces of distortion. If in case there is an appearance of deformation on your tank, such as the bulged bottom, chances are that your water heater was subjected to pressures of more than 300 psi. Generally, the maximum working pressure for which the water heater was designed is supposed to be approximately 150 psi.

When the water inside the water heater is cold, there should be only a static pressure of water on the tank, which is a result of the water weight. From the moment that you turn the water heater ON, the heat process begins, the temperature of the water will increase as well as the volume, and the pressure will only keep going up.

How to Prevent the Increase of Pressure in Water Heaters

If your tank-type water heating system is an open system, and if in case there are no obstructions that can reverse the flow, then the water pressure inside the tank will always be closed to the cold water supply. The hot water will tend to expand back into the cold water supply, and there will be no damage done to the plumbing system. In this situation, the chances for a bulging water heater are absolutely minimal.

If there are obstructions, such as in the checking valves, pressure-reducing valves, the shut-off valve, in the cold water line and there is a presence of water softeners, then the system becomes a closed system. In this situation, the heated water will cause pressure to increase quickly until something ruptures or fails. This is the reason why the expansion tank is a must to use, in order to accept the additional pressure. If in case the expansion tank was not installed, then the hot water pressure may become too great which can cause bulging of the water heater unit or the tank may even rupture.

The correct size of the expansion tank must be used on each and every new water heater installation in order for it to maintain a consistent and safe working pressure. Do keep in mind that the warranty will be voided, so it will be at your expense if something undesirable happens to your water heater unit.

Water, a non-compressible liquid, expands when heated. For each 10°F increase in water temperature, the water expands at about 0.2%. As the temperature increases, the maximum designed water pressure can possibly exceed and therefore cause bulging to the water heater unit.

How to Test Hot Water Pressure inside a Water Heater Unit

One of the most common reasons why your tank-type water heater is leaking may be that there is pressure buildup or there is a significant drop-off inside of the water heater tank (bulging water heater). Below are some steps regarding a simple do-it-yourself project wherein the only tool that you will use is the pressure gauge. When your water heater leaks, it tends to create a puddle on the floor as there is a hole or crack in the tank, or there are dislocated plumbing connections or unions. The steps below will help you to check and how to properly test hot water pressure:

To get the pressure reading inside of the water heater tank, install a pressure gauge on the drain valve outlet and open drain valve.

Close the main shut-off valve that supplies the water heater. Ensure that all the hot water taps are turned off. When the water heater is running and because all the hot taps are closed, the pressure will then build up inside the tank. Run the water heater by means of turning the thermostat up until the main burner or the heating element comes on. Ensure that you constantly check the pressure gauge as the pressure in the tank will tend to increase rapidly.
When the hot water pressure begins to rise up, shut the water heater off by turning down the thermostat. Then, watch the pressure gauge to see if it holds the pressure or if it drops off significantly.
If there are no leaks occurring around the fittings when the pressure drops, that means the tank is leaking.
If the pressure inside the water heater does not rise up, either there is a hot water faucet open in the system or there is a crack or hole in the tank which does not allow the pressure to build up.
If the pressure holds up for a prolonged period of time of about 10 to 15 minutes, then that means the tank is not leaking.
The typical design of a water heater tank is simply having convex top heads and concave bottoms. Because of the excessive pressure inside the tank, the concave bottom may become flattened, or it may change to a convex or bulged shape. This is considered to be very dangerous on gas water heaters, where the movement of the bottom could result in the deformation of the head of the tank as they are directly connected by the rigid flue. This can cause further restriction of the products of combustion from venting through the flue passage and out the chimney.

By means of simply looking into the combustion chamber, you can check if there is any distortion occurring at the bottom of the tank. It is a must to replace bulging water heater tanks if they can no longer be fixed. As a matter of fact, tank-type water heaters with a bulging condition are actually not covered by warranty due to improper installation.


Are you looking for that perfect gas or electric water heater for your home? If you are serious enough about getting a gas or electric water heater unit that is of very good quality and is worth every penny you spend for it, then you need to know a few basics and facts about water heaters. In order to acquire an excellent water heater unit, you need to be familiar with some common terminologies about water heaters.

Flow Rate

Flow rate refers to the maximum flow of hot water from all fixtures that might run at a peak time period.

When you are looking for a water heater that is the right size for your needs, it is recommended that you add up all the flow rates of all the hot-water fixtures and appliances that are present in your home.

Draw Efficiency

Draw efficiency refers to the amount of hot water that is drawn from the tank-type water heater (available to the consumer), at a flow rate of 3 gallons per minute and prior to the outlet water temperature dropping to 25°F.

In simple terms, when you use a storage-type water heater for your water heating needs, about 70% of hot water of the tank’s volume may be drawn prior to the hot water diluting with the incoming cold water. If in case you are looking for a 50-gallon tank-type water heater, this heater will then deliver approximately 35 gallons of hot water (70%) – resulting in 50 gallons x 0.7 = 35 gallons.

Energy Factor (EF)

The energy factor (EF) is the one that shows the efficiency of a water heater unit. It combines the standby efficiency and the thermal efficiency of the water heater. A higher EF means that the water heater is more efficient and has lesser energy loss.

Low-range EF for gas-powered tank-type water heaters is typically between 0.53 and 0.62. The energy efficiency or energy factor will show you how much energy will be used and/or wasted in order to heat the water.

For instance, if the EF is 0.62, then it means that from every dollar that you spend on water heating, $0.62 is being used to heat the water, and the remaining $0.38 is wasted. The high-efficient water heater units are generally Energy Star compliant. The minimal EF for one gas-powered tank-type water heater to be Energy Star qualified is about 0.67.

Recovery Rate

Recovery rate or recovery efficiency refers to the amount of water that is heated to a set temperature per hour.

Gas-powered water heaters are considered to have a 75% recovery rate, meaning that 75% of the heat produced by the gas burner goes toward heating the water, while the remaining 25% is wasted.

Since electric-powered water heaters are equipped with immersion-type heating elements, 99% of heat is produced to heat the water, thus, their recovery rate is 99%.

In simpler terms, the recovery rate shows how many gallons of water, per hour, a water heater unit can raise while the temperature increases by 100°F. A particular water heater unit can be considered to have a faster recovery rate is it has more Watts or BTU than the other units.

Thermal Efficiency and BTU

BTU stands for British Thermal Unit, and it refers to the amount of heat needed to raise the temperature of 1 pound of water 1 degree Fahrenheit.

For instance, 8.25 BTU is needed in order to raise the temperature of 1 gallon of water 1 degree F. Nowadays, many modern homes require 20 BTUs per square foot. When comparing to electricity, 1 watt-hour gives about 3,413 BTUs.

The formula below is used to calculate the required BTUs:

Gallons x 8.25 x 1.0 x temperature rise = BTU

Sample Question: How much BTU is needed in order to heat 100 gallons of water to get 90°F hot water if the incoming water temperature is 50°F?

Solution: 100 gallons x 8.25 x (90°F – 50°F) = 33,000 BTUs

Input Rating

Input rating refers to the amount of fuel in BTUs that is consumed by the water heater unit in an hour.

To get an equivalent gas input in BTU, use the formula above and divide the result by 0.75 (44,000 BTUs with the above inputs).

To see what is the heating element wattage equivalent, multiply the above answer by 0.293 (9,669 W with the above inputs).

Inlet Temperature

The inlet temperature refers to the temperature of the incoming water (or otherwise known as the cold inlet water) which is the cool water coming into the water heater. During the colder months, it is considered to be at 40°F; whereas in southern regions where it is warmer, it’s 50°F.

Peak Period

The peak period refers to the time when the highest demand and hot water draw are. In residential home water heating, the peak period typically occurs once or twice a day (before school or work, and in the evening).

Temperature Rise

The temperature rise refers to the difference in temperature between the incoming cold and outgoing hot water and is shown in C or F degrees.

For instance, if the hot water temperature at the faucet is 120°F, and the incoming cold water temperature is 50°F, then the temperature rise is 70°F.

First Hour Delivery (or First Hour Rating)

The First Hour Delivery (FHD) or First Hour Rating (FHR) is used to describe the performance capability of the water heater unit, or how much of hot water a fully heated water heater can deliver in its first hour of operation.

Remember that a water heater unit does not deliver all 100% of the hot water of a tank’s capacity, but only 70%. Thus, if you have a water heater with a tank size of:

30 gallons, then the available amount of hot water is essentially 21 gallons.
40 gallons (which is rated tank’s capacity), then 28 gallons are available for use.
50 gallons (which is the tank’s capacity), then 35 gallons are available for use.
80 gallons (which is the tank’s capacity), then 56 gallons are available for use.
You can easily calculate the First Hour Delivery by using the formula below:

(Tank Capacity) x 0.7 + (Recovery Rate) = FHD

For instance: 50 gallons Tank capacity x 0.7 + 36 Recovery rate = 71 gallons FHD

Glossary of Terms

Closed System – A system wherein water, when it is heated, will not expand (if the following elements are installed such as the back-flow valve, check valve, or some pressure-reducing valves).

Hard Water – incoming cold water that has a particular percentage of impurities such as calcium and other minerals, which can cause water to have a hard characteristic.

Heat Trap – is an element that restricts the loss of heat through the water connections to a tank.

Hydronic Heating – is the most pleasant form of central heating. It operates by re-circulating hot water, heated by a gas-fired boiler or water heater.

Standby Heat Loss – the heat that is lost from hot water, wherein most of it is through the surface of the tank-type water heater.

Pilot Light – a small flame that is used to ignite the gas in the main burner. The standing pilot burns all the time.

Scale – a buildup layer of lime, calcium or bicarbonates that are typically found at the bottom of a tank and internal elements that may prevent heat transfer.

Simultaneous Heating Operation – both heating elements in an electric-powered water heater operates at the same time.

Non-simultaneous Heating Operation – both heating elements in an electric-powered water heater are not designed to operate at the same time.


The basics and facts about water heaters are a simple yet useful guide when you are looking for a new water heater or you would like to do some DIY installation or troubleshooting. This will help you to understand better some of the basic terms and calculations used in water heaters, which will be tremendously useful and will help save you time and money should you decide to install or troubleshoot your water heater unit by yourself.


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